package com.spring.demo.publicutil.thread;

import java.util.concurrent.CountDownLatch;

/**
 * 线程 CountDownLatch
 * @author youjc
 */
public class T03_CountDownLatch3 {
    private static void usingCountDownLatch() {
        Thread[] threads = new Thread[100];
        CountDownLatch latch = new CountDownLatch(threads.length);
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
                int result = 0;
                for (int j = 0; j < 1000; j++) {
                    System.out.println("j = " + j);
         /*           try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }*/

                }
                latch.countDown();
            });
        }

        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }
        try {
            latch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("end latch");

    }

    private static void usingJoin() {
        Thread[] threads = new Thread[100];
        for (int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(() -> {
                int result = 0;
                for (int j = 0; j < threads.length; j++) {
                    result += j;

                }
            });
        }
        for (int i = 0; i < threads.length; i++) {
            threads[i].start();
        }
        for (int i = 0; i < threads.length; i++) {
            try {
                threads[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
        System.out.println("end join");
    }

    public static void main(String[] args) {
        //usingJoin();
        usingCountDownLatch();
    }
}
